The Agent Index
Infrastructure for AI agents. Tools an agent reaches for mid-workflow to do its job. Verified by the builders who use them every day.
Chroma
Embedded and hosted vector database with a simple Python-first API, popular for RAG prototyping.
Vector StoresPython LibraryPinecone
Fully managed vector database with serverless indexes, hybrid search, and metadata filtering.
Vector StoresREST APIQdrant
Rust-based vector search engine with strong filtering, sparse vector support, and a managed cloud.
Vector StoresREST APITurbopuffer
Object-storage-native vector database designed to store billions of vectors cheaply on S3.
Vector StoresREST APIWeaviate
Open-source vector database with native hybrid search, multi-tenancy, and generative modules.
Vector StoresREST API
The Agent Index is open source. The canonical list lives on GitHub, and every entry on this page is generated from that repo at build time. Contributions are welcome as pull requests. Read the rules before submitting; the bar is sharp, but the review is fast.
Tools are added after they show up in production agent workflows or get strong signal from builders with real usage. Inclusion is the editorial judgment. There is no ranking within categories. Every tool listed has earned its place against the same criterion: can an agent complete its full lifecycle through a fully programmatic path?